I picked up a Judge Dredd this week, and I found a problem. The upper left flipper doesn't seem to work in game(the lower left flipper works as I expect). However, the UL flipper flips during a ball search and during flipper tests. Am I missing a setting? Is this perhaps an expected behavior? I haven't played this game before, so I may be missing something obvious.
Also, I opened up the backbox and found a board that doesn't appear to be in the manual I downloaded. I'll include a picture. What is this board? I did see that the DMD controller is a Rottendog, so perhaps this was part of that.

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Ah. No, it only shows one opto register for that button, as opposed to both on the right flipper. So, this is a dirty or bad opto?

Ok, looking at the opto boards, the one on the left looks like a single flipper opto. The one on the right is clearly a double opto. I looked in the manual on IPDB, and it shows a single for the left and a double for the right. I am now confused.

Yeah, I pulled it off and now I can see that it's just arranged differently. Looks like someone did some surgery to this machine at some point. I'm going to test it and see.

Turns out, someone replaced the resistor at some point and starved the joint of solder. I resoldered it, and everything works fine now. Thanks for the help!